ISB ISB INC memory, SBC memory ISB
N V - B D I Z C
Operation: M <- (M) + 1, A <- (A) - M - ~C / / . . . . / /
+----------------+-----------------------+---------+---------+----------+
| Addressing Mode| Assembly Language Form| OP CODE |No. Bytes|No. Cycles|
+----------------+-----------------------+---------+---------+----------+
| ZeroPage | ISB $FF | $E7 | 2 | 5 |
| ZeroPage,X | ISB $FF,X | $F7 | 2 | 6 |
| Absolute | ISB $FFFF | $EF | 3 | 6 |
| Absolute,X | ISB $FFFF,X | $FF | 3 | 7 |
| Absolute,Y | ISB $FFFF,Y | $FB | 3 | 7 |
| (Indirect,X) | ISB ($FF,X) | $E3 | 2 | 8 |
| (Indirect),Y | ISB ($FF),Y | $F3 | 2 | 8 |
+----------------+-----------------------+---------+---------+----------+
Also known as ISC.